Transmission mechanism for tractors and the like.



` Apc. JoHNsQNgziv4 'TRANSMISSION MECHANISM Fon TnATR s1 -ANQ THELIKE.

` APPLICATION r|LED'1An.24.f1-6. l 4l 21 8,666. Patented Mar. 13,1917.

'UNITED Isrrrrirs PATENT orFioE.

,ALFRED C. JOHNSON. 0F WINTERS, CALIFORNIA.

'rn'ANsMissIoN ivincHaNIsM Fort imnc'roiis'ann 'THE LIKE'.

California, have invented new and useful Improvements in Transmission Mechanism for' Tractors and the like, of which the following isa specification. t

vMy invention relates to improvements in transmission mechanism for tractors and the like, the object of'my 'invention being to provide simple mechanism for tractors by which they can lbe'easily reversed, when required, and can also be turned in .eitherdirection so as to make a very quick turn.

In the accompanying drawing, Figure 1 ed in accordance with vmy invention; Fig. 2 is la detail sectional View through the line 22of Fig. 1.

Referring to the drawing, 1 indicatesthe body of a tractor and 2 the rear a-Xle thereof, upon which are independently mountedl two" traction Wheels 3. These wheels are shown of the-simplestl form, the character of the wheels being immaterial to my invention. 4 indicatesthe ,driving shaft of the motor,

'not shown, of the tractor, which extends` through a central bearing 6. On each side of said bearing said shaft' also extends through a sleeve 7., threaded on the outside,- to turn in an internally threaded vbearing 8" secured-to the body of the tractor. Each sleeve 7 has 4secured thereto, on the side remote from the bearing 6', a collar 9 from which extends an arm 11, the outer end of which is ap'ertured and is engaged by a hook-shaped end of a link 12 connected tov 'one end of a bell crank lever 13, pivoted on said body, as shownat 14, the other end of which is connected toa rod 16 leading to a point convenient for manipulation by the driver of the tractor seated on a seat 17. By moving said rod longitudinallyv the threaded sleeve is turned in one direction or the otherl and is thereby moved longitudinally in one direction or-the other upon .the

v driving shaft. Upon said shaft, on each side of said bearing 6, are also mounteda pair of friction cones 19, keyed' to the shaft but slidablethereon, and connected with each other by rods 21, Aso that the cones of each pair move together longitudinally. The outerv cone of each pair is formed With a clutch rinff 22 which en a es a com anion clutch ring 23 on the threaded sleeve, the effect be- Speccation of Letters Patent;

Patented Mai'. 13, 1917.

Application filed January 24, 1916. Serial No. 73,840.

ing that said outer cone, and therefore' also tudinally on the shafty with -the threaded sleeve, although they do not'rotate therewith. By the longitudinal movement of the threaded sleeve, either of- -the attached pair of cones is adapted to engage a friction cone 24 on a transverse shaft 26 in a bearing 27 formed onv the body of the tractor, said shaft 2,6 carrying at its outer end a'v pinion 28 which meshes with a gear wheel 29 on a shaft 31 rotating in a bearing 32 extending through the body of the tractor, the outer end of which shaft 31 carries a pinion 33 which meshes with an internal gear wheel 34 formed on the inner surface of one of the traction wheels. Y

Since each pairl of cones is thus opera-y tively-connected to onerorthe other of the traction Wheels, and the frictionk cones of each pair are arranged to alternately and eX- clusively engage the friction cone 24 and since each pair of cones can De operated dependently of the other pair, it results that either traction wheel can be rotated in either a forward or a rearward direction independently of the other. YVlien it is desired to go straight ahead, both traction wheels are rotated ina forward direction, and when tov reverse, both of themare rotated in av rearward direction. If it' isdesired to turn to the right, the left-hand traction wheel is rotated in a forward direction while the righthand traction wheel is rotated in a rearward direction, and conversely if to the left. Thus it will be seen that very sha-rp turns can beq to be engaged by one or the other of the cones offsaid pair, traction wheels, operative connections between said traction wheels and the innercone, are compelled to-move longithe last-recited cones respectively, and means vices of each pair being connected to move" together on said shaft, a conical transmission device for each pair, adapted to be engaged by one or the other of the devices of said pair, traction wheels, operative connections between said traction wheels and the lastrecited devices respectively, and means for moving either pair of said devices indpendently on said shaft, to cause one or the other of the devices of said pair to engage the second-named devices.

3. In combination, a driving shaft, tWo pairs of friction c ones rotatable With, and slidable on, said shaft, rods connecting the cones of each pair so that they move together on said shaft, a friction cone for each 15 pair, adapted to be engaged by one or the pair to engage the second-named friction cones. 1

In testimony whereofI have Jhereunto setl my hand in the presence of two subscribing 25 Witnesses.

ALFRED C. JOHNSON, Witnesses: y

F. M. WRIGHT, D. B. RICHARDS.

Copie'of this patent may beobtained for ve cents each, by addressing-.the Commissioner of Patenti,

` Wahington, D. C. 

